Originally Posted by RedRanger02
rwenzing touched on it, i alwas thought that water was a by-product of the catalitic(sp?) converters doing their job....
The three main reactions in a catalytic converter:
So yes, water is a product of hydrocarbon oxidation in a catalytic converter.
Water is also a product of hydrocarbon combustion.
Your engine and catalytic converter are making water in addition to the water already in the air.